President Trump and Senate Republicans' efforts to swiftly confirm conservative judges to federal courts across the country hit a speed bump on Wednesday after Senate Judiciary Committee Chairman Chuck Grassley canceled panel votes set for Thursday on almost two dozen judicial nominations.

The backdrop: The cancellation comes amid a standoff with retiring Sen. Jeff Flake (R-Ariz.), who is holding firm on his pledge to oppose Trump's judicial nominees unless Senate Majority Leader Mitch McConnell schedules a vote on a bipartisan measure to protect the special counsel Robert Mueller. Republicans blocked a vote on the measure Wednesday.